Method of molding and flask part therefor



D. C. MULVIHILL. METHOD OF MOLDING AND FLASK PART'THEREFOR.

APPLICATION FILED JUNE 23, 1919.

Patented May 2, 1922.

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- Janie; CZ up'ic'll MULVIHILL. METHOD OF M0 AND FLASK PART THEREFOR. APPLICATION FILED JUNE 23. I919.

1,414,702, I Patented May 22.

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METHOD on MOLDING arm rrilasx rarer THEREFOR;

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Specification of Letters Patent.

' Patented Ma 2, 1922.

Application filed June 23, 1919. Serial No. 306,049.

concern."

To all whom it may 7 I, DANm-L C. MULVI- Be it known that HILL, resident of Hannibal, 'county of Marion, and State of Missouri, have invented certain new and useful Improvements in Methods of Molding and Flask Parts There for, of -which the cation, and which are illustrated in the accompanying drawings, forming apart thereof. I

An object of the invention is the provision of a method of molding, wherein the entire compacting or condensing of the sand is secured on the j olting machine without the addition of any weighting substance aside from the sand forming part of the finished mold.

A further object of the invention is the provision of a flask part of such a nature that the process referred to may be success. fully carried out.

The structure embodying the invention, shown as different forms of copes capable of carrying out the process, is illustrated in the accompanying drawings,

Fig. 1 is a plan view and Fig. 2 is a section on theline 2-2 of Fig. 1, of a cope in place on a pattern, the

whole supported on a stripping plate and jolting table;

. Fig. 3 is a vertical 3-3 of Fig. 1;

Fig. 4 is a'planview of a modification;

Fig. 5 is a vertical section on the line 5-5 of Fig. 4; and

Fig. 6 is a partial plan view of'another modification.

The structure which has been chosen to illustrate a physical embodiment of the invention is a cope for use in casting car wheels.

section on 'the' line As illustrated the cope comprises an exterior rim 10, and is provided with a chill 11, shown in'Fig. 2 as supported on a pattern 12 and stripping ring 13, the ring and chill being provided wit steady pins, as 14. The stripping ring and pattern are shown as supported on a stripping plate 15, the ring and plate being described and claimed in application Serial No. 306,050 filed of even date herewith. The abovereferred to parts are shown as lying upon the table 16 of a jolting machine of any known type.

a citizen of the United State and;

following is a specifiin which The" interior of ,a cope 'oft he type illustrated is so' great in area as compared with its depth that, if undivided, the mass of sand therein could not be compacted suffici'entlyto prevent drops when lifting thefiask part from'the pattern. To obviate this it has been common to subdivide this space by "means of bars or partitions, as 17 In the past a maximum of fifteen bars has been used,'.and whether this exact number has been used or not they have in all cases been spaced apart a greater distance than the height of the bars.

The present lnvention dlscove'ry that if the bars be ,placed sufliat. I

DANIEL MULVIHILL, on nanni aan, iiirssouar.

depends upon the ciently near together the action of the joltmg machine alone, without hand ramming,

repressing, or the use of a weighting ma; ter alonthe sand while being treated by the jolting machine, will compact the sand.

so that the flask. part and the compacted sand may be stripped from the pattern and lifted successfully. 7

As the result of experiment it is found that ifthe width of the spaces between the bars does not exceed their height the above referred process of compactionby jolting' alone may be successfully carried out with, however, an occasional failure. It is prefeirecLhowever, to so space the bars that their height shall considerably exceed the greatestl distance between them, and to this end'twenty-seve'n bars, 1'7. are shown in Fig. 1 of 'the'drawing; With spaces re sulting from the use of this number of bars it is found that by employment of the jolting machine alone the sand is rendered more dense than when jolted and hand rammed or repressed in the usual manner, and, moveover, that the density of the sand is substantially uniform throughout the mass instead of having a shell on the surface, as results to some extent from previous practice.

To connect and support the inner endof the bars an interior ring 18, shown as conconcentric with rim 10, is provided.

It is found that the process is carried out with more complete success when the bars andalso the interior ring are tapered uniformly from the upper edge to the lower edge. In practice the lower edges are preferably reduced to of an inch.

.For subdivision. of the space in the insubstantially one-eighth I terior of ring 18, stub bars, as 19, may be provided preferably cast integral with the ring, and, as shown, are also taperedfrom above downwardly.

fully illustrated and described in the -copending application. above referred to, the same forming no part of the present in vention.

In order that the ends of the stub bars 19 may be substantially parallel with the flaring dish portion 21 of implement 20, saidends are preferably cut away at their upper portions, as shown at 22 Figs, 2 a'nd 5. I p

The form of cope; shown in. F igs; '1 and 2 has a desirable spacing of bars at their outer ends, but are unnecessarily close together at their inner ends. Forms of the invention are shown in Figs. t and; 6, whereinthe bars are not so closely spaced near the center and are still sufficiently close at;

the circumference. ln the for m of F ig. 6 stub bars, as 23, attached to the rim 1 0 are placed between bars 17 to subdivide the spaces. between bars 17 at" the widest portion. This form of the inventionintrocluces a weakness of construction inthatthe, stub bars are liable to breakage. This Weakness is avoided by the form of Fig.4, which a supplemental interior ring 24: is shown, which ring in effect spans the space between the bars 17 of Fig. (land is connected to.

the end of stub bars 23 by being. cast integral therewith.

The cope illustrated is preferably com structed of cast iron. It is found that when a cope constructed as discl sed is placed with the pattern on a jolting machine and filled with sand and jolted substantially theusual number of times, the sand will be compacted as explained above, and that drops substantially never occur, and, moreover, that the sand need not be more than ordinarily moist to successfully carry out the process.

A gate forming implement is shown at 20, Fig. 1, and is more.

I claim as my inventioril. A flask part for molding car wheels,

comprising bars dividing the sand space of the cope into compartments whose depth.

is substatially greater than the greatest distance between the bars measured in a plane s aid compartments.

perpendicular to a radius bisecting one of V 2. A cope for molding car wheels, com

prising an external rim, and downwardly tapering bars within the rim dividing the sand space into portions whosedepth' jis substantially greater than the greatest distance between the bars measured in a plane perpendicular to a radius bisecting one of said portions.

. 3. A cope comprising an external circular rim, an interior ring concentric therewith,

outer rim, radially disposed bars'attached at their ends, to said rings, the height of said bars being substantially greaterthan the spaces between the bars measured in any plane perpendicular to a radius bisecting the space, and stub bars each attached at one end to said interior ring and extending inwardly therefrom.

The method of molding Icar wheels which comprises providing a circular fiask part, the space within which is divided by radially extending partitions, the maximum spacing of which is less than the least height of the partitions, placingsand in the flask part on a pattern, and compacting the sand by jolting only and without application or other compacting means. DANIEL C. MULVIHILL; 

